note 98769 added to language.references.pass
| From: | PhoneixSegovia at GOOGLEMAILSERVER dot com | Date: | Tue, 06 Jul 2010 15:05:45 +0000 |
| Subject: | note 98769 added to language.references.pass | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-170737@lists.php.net to get a copy of this message | ||
If you call it without nothing (no variable, no constant) then a new variable is created with null
or the default parameter.
If a null parameter is passed, then this (null) variable is used, even with a default value
specified.
A simple example:
<?php
print '<pre>';
function foo(&$a=5){
$a +=2;
print "\nIn foo => $a";
}
function bar(&$a){
$a += 2;
print "\nIn bar => $a";
}
$a;
$b;
print "Initial:\n";
var_dump($a, $b);
foo();
bar();
print "\nAfter void call:\n";
var_dump($a, $b);
foo($a);
bar($b);
print "\nAfter passed:\n";
var_dump($a, $b);
print '</pre>';
?>
Output is:
"Initial:
NULL
NULL
In foo => 7
In bar => 2
After void call:
NULL
NULL
In foo => 2
In bar => 2
After passed:
int(2)
int(2)"
Note that null is equal to 0 in a mathematical expresion.
----
Server IP: 69.147.83.197
Probable Submitter: 80.33.99.95
----
Manual Page -- http://www.php.net/manual/en/language.references.pass.php
Edit -- https://master.php.net/note/edit/98769
Del: integrated -- https://master.php.net/note/delete/98769/integrated
Del: useless -- https://master.php.net/note/delete/98769/useless
Del: bad code -- https://master.php.net/note/delete/98769/bad+code
Del: spam -- https://master.php.net/note/delete/98769/spam
Del: non-english -- https://master.php.net/note/delete/98769/non-english
Del: in docs -- https://master.php.net/note/delete/98769/in+docs
Del: other reasons-- https://master.php.net/note/delete/98769
Reject -- https://master.php.net/note/reject/98769
Search -- https://master.php.net/manage/user-notes.php